Here are the some of the most ridiculous startup ideas that eventually became successful:

Facebook

The world needs yet another Myspace or Friendster, except several years late. We’ll only open it up to a few thousand overworked, anti-social Ivy Leaguers. Everyone else will then join since Harvard students are so cool.

iOS

The iOS is a brand new operating system that doesn’t run a single one of the millions of applications that have been developed for Mac OS, Windows, or Linux. Only Apple can build apps for it. It won’t have cut and paste.

LinkedIn

This is a professional social network, aimed at busy 30-and-40-somethings who will use it once every 5 years when they go job searching.

Amazon

They sell books online, even though users are still scared to use credit cards on the web. Their shipping costs will eat up any money they save. They’ll do it for the convenience, even though they have to wait a week for the book.

Virgin Atlantic

Airlines are cool. Let’s start one. How hard could it be? We’ll differentiate with a funny safety video and by not being jerks.

Craigslist

It will be ugly and it will be free.

Google

We are building the world’s 20th search engine at a time when most of the others have been abandoned as commoditized money-losers. We’ll strip out all of the ad-supported news and portal features so you won’t be distracted from using the free search stuff.

Tesla

Instead of just building batteries and selling them to Detroit, we are going to build our own cars from scratch plus own the distribution network. During a recession and a cleantech backlash.

SpaceX

If NASA can do it, so can we! It ain’t rocket science.

Twitter

It is like email, SMS or RSS. Except it does a lot less. It will be used mostly by geeks at first, followed by Britney Spears and Charlie Sheen.

Paperless Post

We are like Evite, except you pay us. All of your friends will know that you are an idiot.

Instagram

Filters! That’s right, we got filters!

PayPal

People will use their insecure AOL and Yahoo email addresses to pay each other real money, backed by a non-bank with a cute name run by 20-somethings.

Mint

Give us all of your bank, brokerage, and credit card information. We’ll give it back to you with nice fonts. To make you feel richer, we’ll make them green.

Dropbox

We are going to build a file sharing and syncing solution when the market has a dozen of them that no one uses, supported by big companies like Microsoft. It will only do one thing well, and you’ll have to move all of your content to use it.

Palantir

We’ll build arcane analytics software, put the company in California, hire a bunch of new college grad engineers, many of them immigrants, hire no sales reps, and close giant deals with D.C.-based defense and intelligence agencies!

GitHub

Software engineers will pay monthly fees for the rest of their lives in order to create free software out of other free software!

Firefox

We are going to build a better web browser, even though 90 percent of the world’s computers already have a free one built in. One guy will do most of the work.